Wrangler Has a Free CLI API for Deploying to Cloudflare Workers

Wrangler is the CLI for Cloudflare Workers — deploy JavaScript to 300+ edge locations in seconds. Plus access to KV, R2, D1, Queues, and Durable Objects.

Getting Started

npm create cloudflare@latest my-worker
cd my-worker
npx wrangler dev  # Local development
npx wrangler deploy  # Deploy globally

Worker Code

export default {
  async fetch(request: Request, env: Env): Promise<Response> {
    const url = new URL(request.url);

    if (url.pathname === '/api/hello') {
      return Response.json({ message: 'Hello from the edge!' });
    }

    if (url.pathname === '/api/geo') {
      return Response.json({
        country: request.cf?.country,
        city: request.cf?.city,
        timezone: request.cf?.timezone
      });
    }

    return new Response('Not Found', { status: 404 });
  }
};

KV Storage

// wrangler.toml: [[kv_namespaces]] binding = "CACHE" id = "abc123"

export default {
  async fetch(request: Request, env: Env) {
    // Read
    const cached = await env.CACHE.get('my-key');
    if (cached) return new Response(cached);

    // Write with TTL
    await env.CACHE.put('my-key', 'value', { expirationTtl: 3600 });

    return new Response('Stored');
  }
};

D1 Database (SQLite at the Edge)

export default {
  async fetch(request: Request, env: Env) {
    const { results } = await env.DB.prepare(
      'SELECT * FROM users WHERE active = ?'
    ).bind(1).all();

    return Response.json(results);
  }
};

R2 Object Storage

export default {
  async fetch(request: Request, env: Env) {
    if (request.method === 'PUT') {
      const body = await request.arrayBuffer();
      await env.BUCKET.put('myfile.pdf', body);
      return new Response('Uploaded');
    }

    const object = await env.BUCKET.get('myfile.pdf');
    return new Response(object?.body);
  }
};

Wrangler CLI Commands

wrangler dev              # Local dev server
wrangler deploy           # Deploy to production
wrangler tail             # Stream live logs
wrangler d1 execute DB --command "SELECT * FROM users"
wrangler kv:key list --binding CACHE
wrangler r2 object get bucket/key

Why This Matters

• Global by default: Code runs in 300+ locations
• Free tier: 100K requests/day
• Full platform: KV + D1 + R2 + Queues + Durable Objects
• Sub-millisecond cold start: Fastest serverless runtime

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